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Summary of topic III: -- Plasma sources and diagnostics for PMI facilities --

Summary of topic III: -- Plasma sources and diagnostics for PMI facilities --. Plasma Source. Session contains 5 presentations ··· 1. “High Flux Steady-State Plasma Source for Integrated PMI-PFC Test Stand” presented by Y. Raitses , PPPL

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Summary of topic III: -- Plasma sources and diagnostics for PMI facilities --

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  1. Summary of topic III:-- Plasma sources and diagnostics for PMI facilities -- Plasma Source Session contains 5 presentations ··· 1. “High Flux Steady-State Plasma Source for Integrated PMI-PFC Test Stand” presented by Y. Raitses, PPPL 2. “Thermal regime of LaB6 cathode of plasma linear device” presented by A. Ivanov (instead of V.I. Davydenko), Dudker Inst. 3. “Intense RF Plasma Source Research” presented by R. Goulding, ORNL 4. “A collarborative Proposal to Explore on PSI-2 “Glow Discharge Spectroscopy “ as an in vacuo PMIF Diagnostic" presented by C.C. Klepper, ORNL 5. “Use of the focusing multi slit ion optical system at the diagnostic neutral beam injectior RUDI” presented by A. Listpad, Budker Inst. Diag-nostics

  2. [ 1 ] High Flux Steady-State Plasma Source for Integrated PMI-PFC Test Stand Yevgeny Raitses, Stewart Zweben Robert Goldston, Michael Jaworski and Randy Wilson PPPL, Princeton, New Jersey 08543, USA PMI Workshop, Julich 19-21 September, 2011

  3. Possible Source Options for Initial Phases of Integrated PMI-PFC Test-Stand • A steady-state currentless plasma flow of energetic ions (~ 100 eV) to a floating plate • RF-Plasma + ICH/ECH heating, Plasma thrusters (Hall, MPD, Arcjet, VASIMR) • May be IDEAL or GDT or ZaP ? • Non-ambipolar plasma flow to a biased target-plate • Arc plasma sources, RF-plasma sources (helicon, ICP), DC-RF plasma sources • Heat sources • Arc discharge, neutral and electron beams GAMMA 10 E-div.

  4. Hall thruster (HT) can source highly ionized currentless plasma flow in a broad energy range Ne ~ 5 1018 m-3 in ionization region Ion kinetic energy ~102-103eV Ion temperature ~ 1 eV Current density ~103 -104 A/m2 Steady-state operation 12 cm diam. 2 kW PPPL HT The use of Hall thruster for the small prototype test-stand would make possible to study liquid lithium wall with and without target bias

  5. Summary • There are no readily available plasma sources for the required PMI-PFC parameters: 1 MW power flux, 10-40 MW/m2 at 1 Tesla, Deuterium,  5 s • High power source options which could be developed to match the proposed PMI-PFC test stand requirements: • GDT: could be the best way to go if it could operate  5 sec • Helicon+ICH:  1 MW, high B-field (~ 1 Tesla) Deuterium operation need to be demonstrated (Note: Ad Astra results: 200 kW at ~ 1-2 Tesla for Ar) • Arc plasma sources (Magnum or MPD types): matches all requirements including  10 MW/m2(> 1MW power level is likely feasible) • Limitation: target-plate needs to be biased • Challenges: high background pressure ~ 10 mtorr • Small scale PMI-PFC prototype test stand is proposed for internal PPPL support (not funded yet): • The prototype test stand will be modular and may use variety of plasma sources, including currentless (Hall thrusters) and non-ambipolar with biased plate (RF-plasma sources, arc discharges, arc plasma sources, electron gun)

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  9. Low energy, high flux incident ions sputter away surface layers with minimum damage to the bulk sample. • Emission spectrum is measured to determine composition, layer-by-layer. What is GDS or GDOES? (“Glow Discharge Spectroscopy” or “Glow Discharge Optical Emission Spectroscopy”) ** Image from Y. Hatano et al, 13th PFMC Workshop (Rosenheim, May 09th - 13th, 2011)

  10. PSI-2 linear facility Re-entrant Anode IR Camera RF Source Sample • Problems: • Containment of discharge • Containment of sputtered species Laser beam Sample To Spectrometer or Filterscopes

  11. Summary • PSI-2 can provide a good opportunity to develop GDOES as an in vacuo diagnostic for PMI applications • Sufficient literature from surface science literature and initial (ex-situ) application for fusion PMI • Port access seems sufficient for a first, rudimentary set-up • RF supplies and matching circuit element are available at ORNL RF Lab • Industrial systems already available and teaming with manufacturers possible to get custom systems. • Early proof-of-principle feasible on time to provide more complete diagnostic for JULE-PSI and ORNL-PMTS • Community participation is welcome.

  12. [ 5 ] Use of the focusing multi-slit ion optical system at the diagnostic injector RUDI A.Listopad1, J.Coenen2, V.Davydenko1, A.Ivanov1, V.Mishagin1, V.Savkin1, G.Shulzhenko1, B.Schweer2 and R.Uhlemann2 1Budker Institute of Nuclear Physics SB RAS, 630090 Novosibirsk, RUSSIA 2 Trilateral Euregio Cluster, Institut fuer Energie- und Klimaforschung, Forschungszentrum Juelich GmbH, Association EURATOM-FZJ, 52425 Juelich, Germany 1A.A.Listopad@inp.nsk.su

  13. Atomic driver based on arc generator Water cooling Lanthanum hexaboribe thermocathode Arc-discharge channel Converter H 0

  14. Round and slit RUDI beamlet geometries U1=50 kV U2=43 kV U3=-500 V U4=0 V BEAM

  15. RUDI beam divergence scan at 45 kV (6,6 kV 1st gap)

  16. Charge-eXchange Recombination Spectroscopy DED H-beam Toroidal observation system Lower observation system

  17. Summary • Optical beam diagnostic complex was developed • New slit ion optics is introduced (June 2010) • Beam current achieved 2,8A (at 49 kV, due to HV PS power limit) • Beam diameter at 2m ~3cm along the slits • Beam species composition ~80% protons • More than 100% CXRS signal level rise • New arc-discharge element has provided 6-8 s beam duration

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